py/gc: Add gc_sweep_all() function to run all remaining finalisers.

This patch adds the gc_sweep_all() function which does a garbage collection
without tracing any root pointers, so frees all the memory, and most
importantly runs any remaining finalisers.

This helps primarily for soft reset: it will close any open files, any open
sockets, and help to get the system back to a clean state upon soft reset.

1 files changed, 7 insertions, 0 deletions

diff --git a/py/gc.c b/py/gc.c
index e92b81ece..0fc43ef49 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -362,6 +362,13 @@ void gc_collect_end(void) {
     GC_EXIT();
 }
 
+void gc_sweep_all(void) {
+    GC_ENTER();
+    MP_STATE_MEM(gc_lock_depth)++;
+    MP_STATE_MEM(gc_stack_overflow) = 0;
+    gc_collect_end();
+}
+
 void gc_info(gc_info_t *info) {
     GC_ENTER();
     info->total = MP_STATE_MEM(gc_pool_end) - MP_STATE_MEM(gc_pool_start);